iptman
SILVER Star
An thoughts on making a version with an O2 bung for efi setups?
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I think we would be foolish not to!An thoughts on making a version with an O2 bung for efi setups?
We have the same disease.We are all connected...
We have the same disease.
Just out of curiosity on the process. So you'll have a "fitup" flange of sorts with round holes to locate the ends of the tubes for fitting/tacking everything up, then remove the fitup flange from the engine end of the 6 tubes, flare the round ends to square, and then install/weld the final flange? Tooling can't be cheap! Yikes. Thanks for sharing the process and taking the dive to manufacture these.Our supplier has been working on the proof of concept tooling to create the square port shape from the 1-5/8" primary tubing. There will be tooling involved to make the ends of the tube a rectangle for the flange. You have to do this operation with the header tacked together to ensure the tube is in the correct location – so you cannot really purchase the tube pro-formed.
The test tool is 3D printed. This is development, before we go for an actual tool in hardened steel.
In the attached photos, you can see the results of forming the tube (and the damage to the 3D printed "test tool") and fitment against the existing flanges that I purchased from @65swb45. As a reminder, these are not the final flange design, and this is nothing like final tooling.
Anyway, Rev A testing is complete and needs only minor tweaking to achieve a more complete overall shape with the metal spring back.
The 3 into 1 collectors are in process as well.
Just thought a few here might be interested in the process.
View attachment 3007259View attachment 3007260View attachment 3007261View attachment 3007262
Hello All, been followin this thread... No posts in over a month...Any progress GonzoJust out of curiosity on the process. So you'll have a "fitup" flange of sorts with round holes to locate the ends of the tubes for fitting/tacking everything up, then remove the fitup flange from the engine end of the 6 tubes, flare the round ends to square, and then install/weld the final flange? Tooling can't be cheap! Yikes. Thanks for sharing the process and taking the dive to manufacture these.
Hello All, been followin this thread... No posts in over a month...Any progress Gonzo
??
thanks...Funny you should ask @cruizinnube - we are working towards a final design that we can then talk about here!
Great timing, and stay tuned!
Heck yeah!thanks...
Heck yeah!
Looking forward to posting some juicy details soon!
That is a GREAT piece of tech Nolan. I had seriously considered having O2 bungs added to part of my next batch of headers. I would most certainly have put them where you learned from experience NOT to put them.The collector is not a good place to supply an O2 bung. That’s where I used to install mine before Holley changed its guidance to around 8” past the collector.
One thing I do know is If the flange gasket goes and the bung is right there then it takes the O2 with it. That’s one reason I know I moved all mine.
Nolan is right, you don’t want the O2 bung too close to the primaries or you can end up with the ECU a bit confused. You also don’t want it too far or the ECU won’t track the stoichiometry very well. Holley has a setting ("Closed Loop Speed") to attempt to compensate for this.
Anyway, we’re considering avoiding the 3-bolt flange and using a bit more modern clamp on at least the stainless version.
The O2 bung could be placed in the outlet side of this clamp, it would allow the customer to rotate the bung and sensor to the desired position prior to final weld.
View attachment 3036052
Can you tell me more about this?One thing I do know is If the flange gasket goes and the bung is right there then it takes the O2 with it. That’s one reason I know I moved all mine.